1. A flexible drive shaft rigidity measuring device is characterized in that: comprises a base (1), a scale (2), a transparent baffle (3), two clamping bar blocks (4) and two fastening screws (5);

the base (1) comprises a semicircular vertical plate; the end surface of the straight section of the semicircular vertical plate faces downwards, and the end surface of the straight section of the semicircular vertical plate is provided with a rectangular vertical plate in an extending way;

a semicircular groove (6) is formed in the front plate surface of the semicircular vertical plate, and the groove wall of the straight section of the semicircular groove (6) faces upwards; a vertical flat hole (7) and two horizontal flat holes (8) which are bilaterally symmetrical are arranged between the arc-shaped groove wall of the semicircular groove (6) and the arc-shaped end surface of the semicircular vertical plate in a run-through manner; the upper hole walls of the two transverse flat holes (8) are connected into a whole, and the front hole walls of the two transverse flat holes (8) are flush with the rear hole wall of the vertical flat hole (7); the groove bottom of the semicircular groove (6) is provided with an I-shaped rectangular groove (9); the upper groove wall of the I-shaped rectangular groove (9) is connected with the upper hole walls of the two transverse flat holes (8) into a whole; the lower groove wall of the I-shaped rectangular groove (9) is connected with the straight section groove wall of the semicircular groove (6) into a whole; two I-shaped limiting blocks (10) which are symmetrical left and right are arranged at the rear edge of the groove wall of the straight section of the semicircular groove (6) in an extending way; two II-th limiting blocks (11) which are bilaterally symmetrical are arranged at the front edge of the groove wall of the straight section of the semicircular groove (6) in an extending way;

the front plate surface of the rectangular vertical plate is provided with a vertical groove I (12), two bilaterally symmetrical vertical grooves II (13) and two bilaterally symmetrical rectangular grooves II (14); the upper end of the I vertical groove (12) penetrates through the middle part of the groove wall of the straight section of the semicircular groove (6); the lower end of the I vertical groove (12) penetrates through the middle of the lower end face of the rectangular vertical plate; the bottom of the first vertical groove (12) is flush with the bottom of the semicircular groove (6); the upper ends of the two II vertical grooves (13) are respectively communicated with the left end of the groove wall of the straight section of the semicircular groove (6) and the right end of the groove wall of the straight section; the lower ends of the two II vertical grooves (13) respectively penetrate through the left part of the lower end face and the right part of the lower end face of the rectangular vertical plate; the bottoms of the two II vertical grooves (13) are connected with the bottoms of the semicircular grooves (6) into a whole; the two II-th rectangular grooves (14) are respectively communicated with the upper parts of the two II-th vertical grooves (13) into a whole; the bottoms of the two II rectangular grooves (14) are respectively connected with the bottoms of the two II vertical grooves (13) into a whole; a transverse screw hole (15) is respectively arranged between the left groove wall of the II-th rectangular groove (14) close to the left and the left end face of the rectangular vertical plate in a penetrating way, and between the right groove wall of the II-th rectangular groove (14) close to the right and the right end face of the rectangular vertical plate in a penetrating way;

the scale (2) is fixedly embedded in the I-th rectangular groove (9); the transparent baffle (3) can slidably penetrate through the vertical flat hole (7); the lower edge of the rear plate surface of the transparent baffle (3) is respectively in separable contact with the two I-th limiting strip blocks (10); the lower edge of the front plate surface of the transparent baffle (3) is respectively in separable contact with the two II-th limiting strip blocks (11); the two clamping and pressing strip blocks (4) are movably embedded in the two II-th rectangular grooves (14) respectively; the two fastening screws (5) are respectively screwed in the two transverse screw holes (15), and the tail end surfaces of the two fastening screws (5) are respectively in separable contact with the two clamping and pressing strip blocks (4).

2. A flexible drive shaft stiffness measurement device according to claim 1, wherein: the right surface of the left clamping and pressing strip block (4) and the left surface of the right clamping and pressing strip block (4) are respectively adhered with a layer of spongy cushion.

3. A flexible drive shaft stiffness measurement device according to claim 1, wherein: the distance between the two I-th limiting blocks (10) is smaller than the distance between the two II-th limiting blocks (11).

4. A flexible drive shaft stiffness measurement device according to claim 1, wherein: the radius of the semicircular groove (6) is 20 mm-40 mm, and the depth is 3 mm-6 mm; the width of the vertical groove (12) I is 1 mm-3 mm, and the depth is 3 mm-6 mm; the width of each vertical groove (13) of the second II is 1 mm-3 mm, and the depth is 3 mm-6 mm.

5. A flexible drive shaft rigidity measuring method which is realized based on a flexible drive shaft rigidity measuring apparatus according to claim 1, characterized in that: the method is realized by adopting the following steps:

the method comprises the following steps: the base (1) is horizontally placed, the transparent baffle (3) is pulled out of the vertical flat hole (7), and then the two fastening screws (5) are unscrewed, so that the tail end surfaces of the two fastening screws (5) are respectively separated from the two clamping bar blocks (4);

step two: bending a flexible driving shaft (16) to be measured, embedding the flexible driving shaft (16) in the semicircular groove (6) and the two II-th vertical grooves (13), and then screwing the two fastening screws (5), so that the tail end surfaces of the two fastening screws (5) respectively push the two clamping bar blocks (4), and the two clamping bar blocks (4) respectively clamp two straight sections of the flexible driving shaft (16); adjusting the position of the flexible driving shaft (16) to make the top point of the arc-shaped section of the flexible driving shaft (16) align to a certain scale value on the scale (2), and reading and recording the scale value;

step three: selecting a thin line (17) and a weight (18); the thread (17) is embedded in the I-th vertical groove (12), the head end of the thread (17) is fixed with the top point of the arc-shaped section of the flexible driving shaft (16), and then the weight (18) is fixed at the tail end of the thread (17);

step four: firstly, inserting the transparent baffle (3) into the vertical flat hole (7), and then vertically placing the base (1); at the moment, under the action of the gravity of the weight (18), the weight (18) pulls the arc-shaped section of the flexible driving shaft (16) downwards through the thin line (17), so that the top point of the arc-shaped section of the flexible driving shaft (16) moves downwards and is aligned with a certain scale value on the scale (2), and the scale value is read and recorded; in the process, the left part and the right part of the arc-shaped section of the flexible driving shaft (16) simultaneously swell and respectively extend into the two transverse flat holes (8);

step five: calculating the rigidity of the flexible driving shaft (16) according to the difference of the two recorded scale values, thereby completing the rigidity measurement; the specific calculation formula is as follows:

in the formula: q represents the stiffness of the flexible drive shaft (16); m represents the mass of the weight (18); g represents the gravitational acceleration; s represents the difference between the scale values of the two recordings.

6. A method of measuring the stiffness of a flexible driveshaft according to claim 5, wherein: in the second step and the fourth step, the reading of the scale value is performed by using an electronic magnifier.

7. A method of measuring the stiffness of a flexible driveshaft according to claim 5, wherein: in the second step, the scale value aligned with the arc section vertex of the flexible driving shaft (16) is zero.

8. A method of measuring the stiffness of a flexible driveshaft according to claim 5, wherein: the theoretical value of the stiffness of the flexible drive shaft (16) is calculated by the formula:

in the formula: e represents the modulus of elasticity of the flexible drive shaft (16); r represents the arc segment radius of the flexible drive shaft (16); i represents the moment of inertia of the flexible drive shaft (16); a represents the cross-sectional area of the flexible drive shaft (16).

Background

Minimally invasive interventional therapy is one of the main means for treating cardiovascular diseases, is also used for treating partial diseases such as tumors and the like, and is an industry which is mainly developed in the future medical industry. The power transmission in the minimally invasive interventional therapy process often needs to use a flexible driving shaft, and the mechanical property of the flexible driving shaft is directly related to the operability and the safety of the therapy. Specifically, if the rigidity of the flexible driving shaft is too high, the flexible driving shaft cannot be bent at a large angle during the treatment, so that the flexible driving shaft cannot pass through a bent path to reach the affected part, and sometimes, even if the flexible driving shaft can pass through the affected part, the excessive bending force acts on the tissue contacting the flexible driving shaft, so that the tissue is damaged during the transmission, and the safety of the treatment is affected. If the rigidity of the flexible driving shaft is too small, the maneuverability of the flexible driving shaft in the treatment process is poor, and the flexible driving shaft cannot reach a designated affected part quickly according to the requirement, so that the operation time is too long or the operation fails. Therefore, in order to ensure the smooth proceeding of the minimally invasive interventional therapy process, the rigidity of the flexible driving shaft needs to be accurately controlled according to the requirements of using the lesion part and the requirements of doctors on operation when the flexible driving shaft is designed and manufactured. In order to accurately control the stiffness of the flexible drive shaft, it is necessary to accurately measure the stiffness of the flexible drive shaft. However, in the prior art, there is no device capable of accurately measuring the rigidity of the flexible drive shaft.

Disclosure of Invention

The invention provides a device and a method for measuring the rigidity of a flexible driving shaft, aiming at solving the problem that no device capable of accurately measuring the rigidity of the flexible driving shaft exists at present.

The invention is realized by adopting the following technical scheme:

a device for measuring the rigidity of a flexible driving shaft comprises a base, a scale, a transparent baffle, two clamping strip blocks and two fastening screws;

the base comprises a semicircular vertical plate; the end surface of the straight section of the semicircular vertical plate faces downwards, and the end surface of the straight section of the semicircular vertical plate is provided with a rectangular vertical plate in an extending way;

the front plate surface of the semicircular vertical plate is provided with a semicircular groove, and the straight section groove wall of the semicircular groove faces upwards; a vertical flat hole and two horizontal flat holes which are bilaterally symmetrical are arranged between the arc-shaped section groove wall of the semicircular groove and the arc-shaped section end surface of the semicircular vertical plate in a run-through manner; the upper hole walls of the two transverse flat holes are connected into a whole, and the front hole walls of the two transverse flat holes are flush with the rear hole walls of the vertical flat holes; the bottom of the semicircular groove is provided with an I-shaped rectangular groove; the upper groove wall of the first rectangular groove is connected with the upper hole walls of the two transverse flat holes into a whole; the lower groove wall of the first rectangular groove is connected with the straight section groove wall of the semicircular groove into a whole; two I-th limiting blocks which are symmetrical left and right are arranged at the rear edge of the groove wall of the straight section of the semicircular groove in an extending way; two II-th limiting blocks which are bilaterally symmetrical extend from the front edge of the groove wall of the straight section of the semicircular groove;

the front plate surface of the rectangular vertical plate is provided with a first vertical groove, two second vertical grooves which are bilaterally symmetrical and two second rectangular grooves which are bilaterally symmetrical; the upper end of the first vertical groove penetrates through the middle part of the groove wall of the straight section of the semicircular groove; the lower end of the first vertical groove penetrates through the middle of the lower end face of the rectangular vertical plate; the groove bottom of the first vertical groove is flush with the groove bottom of the semicircular groove; the upper ends of the two II vertical grooves are respectively communicated with the left end of the groove wall of the straight section of the semicircular groove and the right end of the groove wall of the straight section; the lower ends of the two II vertical grooves respectively penetrate through the left part of the lower end face and the right part of the lower end face of the rectangular vertical plate; the bottoms of the two II vertical grooves are connected with the bottoms of the semicircular grooves into a whole; the two II rectangular grooves are respectively communicated with the upper parts of the two II vertical grooves into a whole; the bottoms of the two II rectangular grooves are respectively connected with the bottoms of the two II vertical grooves into a whole; a transverse screw hole is respectively arranged between the left groove wall of the II-th rectangular groove close to the left and the left end face of the rectangular vertical plate and between the right groove wall of the II-th rectangular groove close to the right and the right end face of the rectangular vertical plate in a penetrating manner;

the scale is fixedly embedded in the I-th rectangular groove; the transparent baffle plate can slidably penetrate through the vertical flat hole; the lower edge of the rear plate surface of the transparent baffle is respectively in separable contact with the two I-shaped limiting strip blocks; the lower edge of the front plate surface of the transparent baffle is respectively in separable contact with the two II limit strips; the two clamping and pressing strip blocks are movably embedded in the two II rectangular grooves respectively; the two fastening screws are screwed in the two transverse screw holes respectively, and the tail end surfaces of the two fastening screws are in separable contact with the two clamping and pressing strip blocks respectively.

A method for measuring the rigidity of a flexible driving shaft (the method is realized based on the device for measuring the rigidity of the flexible driving shaft provided by the invention), which is realized by adopting the following steps:

the method comprises the following steps: firstly, horizontally placing the base, then drawing out the transparent baffle from the vertical flat hole, and then unscrewing the two fastening screws, so that the tail end surfaces of the two fastening screws respectively leave the two clamping bar blocks;

step two: bending a flexible driving shaft to be measured, embedding the flexible driving shaft in the semicircular groove and the two II-th vertical grooves, and then screwing the two fastening screws, so that the tail end surfaces of the two fastening screws respectively push the two clamping bar blocks, and the two clamping bar blocks respectively clamp the two straight sections of the flexible driving shaft; adjusting the position of the flexible driving shaft to enable the vertex of the arc-shaped section of the flexible driving shaft to be aligned to a certain scale value on the scale, and reading and recording the scale value;

step three: selecting a thin line and a weight; embedding the thin wire in the I-th vertical groove, fixing the head end of the thin wire with the top point of the arc-shaped section of the flexible driving shaft, and fixing the weight at the tail end of the thin wire;

step four: inserting the transparent baffle into the vertical flat hole, and vertically placing the base; at the moment, under the action of the gravity of the weight, the weight pulls the arc-shaped section of the flexible driving shaft downwards through the thin line, so that the top point of the arc-shaped section of the flexible driving shaft moves downwards and is aligned with a certain scale value on the scale, and the scale value is read and recorded; in the process, the left part and the right part of the arc-shaped section of the flexible driving shaft simultaneously swell and respectively extend into the two transverse flat holes;

step five: calculating the rigidity of the flexible driving shaft according to the difference of the scale values recorded twice, thereby completing rigidity measurement; the specific calculation formula is as follows:

in the formula: q represents the stiffness of the flexible drive shaft; m represents the mass of the weight; g represents the gravitational acceleration; s represents the difference between the scale values of the two recordings.

The device and the method for measuring the rigidity of the flexible driving shaft are based on a brand new structure and principle, and realize accurate, convenient and quick measurement of the rigidity of the flexible driving shaft, thereby realizing accurate control of the rigidity of the flexible driving shaft and ensuring smooth implementation of a minimally invasive interventional therapy process.

The device has the advantages of reasonable structure and ingenious design, effectively solves the problem that no device capable of accurately measuring the rigidity of the flexible driving shaft exists at present, and is suitable for design and manufacture of the flexible driving shaft.

Drawings

Fig. 1 is an exploded view of a first structure of a stiffness measuring device of a flexible driving shaft according to the present invention.

Fig. 2 is an exploded view of a structure of a device for measuring the rigidity of a flexible driving shaft according to the present invention.

Fig. 3 is a schematic diagram of a method for measuring the stiffness of a flexible drive shaft according to the present invention.

In the figure: 1-base, 2-scale, 3-transparent baffle, 4-clamping bar block, 5-fastening screw, 6-semicircular groove, 7-vertical flat hole, 8-horizontal flat hole, 9-I rectangular groove, 10-I limiting bar block, 11-II limiting bar block, 12-I vertical groove, 13-II vertical groove, 14-II rectangular groove, 15-horizontal screw hole, 16-flexible driving shaft, 17-thin line and 18-weight.

Detailed Description

A device for measuring the rigidity of a flexible driving shaft comprises a base 1, a scale 2, a transparent baffle 3, two clamping strip blocks 4 and two fastening screws 5;

the base 1 comprises a semicircular vertical plate; the end surface of the straight section of the semicircular vertical plate faces downwards, and the end surface of the straight section of the semicircular vertical plate is provided with a rectangular vertical plate in an extending way;

a semicircular groove 6 is formed in the front plate surface of the semicircular vertical plate, and the groove wall of the straight section of the semicircular groove 6 faces upwards; a vertical flat hole 7 and two horizontal flat holes 8 which are bilaterally symmetrical are arranged between the arc-shaped groove wall of the semicircular groove 6 and the arc-shaped end surface of the semicircular vertical plate in a run-through manner; the upper hole walls of the two transverse flat holes 8 are connected into a whole, and the front hole walls of the two transverse flat holes 8 are flush with the rear hole walls of the vertical flat holes 7; the groove bottom of the semicircular groove 6 is provided with an I-shaped rectangular groove 9; the upper groove wall of the I-shaped rectangular groove 9 is connected with the upper hole walls of the two transverse flat holes 8 into a whole; the lower groove wall of the I-shaped rectangular groove 9 is connected with the straight section groove wall of the semicircular groove 6 into a whole; two I-th limiting blocks 10 which are bilaterally symmetrical are arranged at the rear edge of the groove wall of the straight section of the semicircular groove 6 in an extending way; two II-th limiting blocks 11 which are bilaterally symmetrical are arranged at the front edge of the straight section groove wall of the semicircular groove 6 in an extending manner;

the front plate surface of the rectangular vertical plate is provided with an I vertical groove 12, two II vertical grooves 13 which are bilaterally symmetrical and two II rectangular grooves 14 which are bilaterally symmetrical; the upper end of the I vertical groove 12 penetrates through the middle part of the straight section groove wall of the semicircular groove 6; the lower end of the I vertical groove 12 penetrates through the middle of the lower end face of the rectangular vertical plate; the bottom of the vertical groove 12 is flush with the bottom of the semicircular groove 6; the upper ends of the two II vertical grooves 13 respectively penetrate through the left end of the groove wall of the straight section and the right end of the groove wall of the straight section of the semicircular groove 6; the lower ends of the two II vertical grooves 13 respectively penetrate through the left part of the lower end face and the right part of the lower end face of the rectangular vertical plate; the bottoms of the two II vertical grooves 13 are connected with the bottoms of the semicircular grooves 6 into a whole; the two II rectangular grooves 14 are respectively communicated with the upper parts of the two II vertical grooves 13 into a whole; the bottoms of the two II rectangular grooves 14 are respectively connected with the bottoms of the two II vertical grooves 13 into a whole; a transverse screw hole 15 is respectively arranged between the left groove wall of the II-th rectangular groove 14 close to the left and the left end face of the rectangular vertical plate in a penetrating manner, and between the right groove wall of the II-th rectangular groove 14 close to the right and the right end face of the rectangular vertical plate in a penetrating manner;

the scale 2 is fixedly embedded in the I-th rectangular groove 9; the transparent baffle 3 can slidably penetrate through the vertical flat hole 7; the lower edge of the rear plate surface of the transparent baffle 3 is respectively in separable contact with the two I-shaped limiting strips 10; the lower edge of the front plate surface of the transparent baffle 3 is respectively in separable contact with the two II limit strips 11; the two clamping and pressing strip blocks 4 are movably embedded in the two II rectangular grooves 14 respectively; the two fastening screws 5 are screwed in the two transverse screw holes 15 respectively, and the tail end surfaces of the two fastening screws 5 are in separable contact with the two clamping and pressing bar blocks 4 respectively.

The right surface of the left holding strip block 4 and the left surface of the right holding strip block 4 are respectively adhered with a layer of spongy cushion. When the flexible driving shaft detection device is used, the spongy cushion can prevent the flexible driving shaft from being crushed, and therefore nondestructive testing is guaranteed.

The distance between the two I-th limiting blocks 10 is smaller than the distance between the two II-th limiting blocks 11.

The radius of the semicircular groove 6 is 20 mm-40 mm, and the depth is 3 mm-6 mm; the width of the vertical groove 12 of the I is 1mm to 3mm, and the depth is 3mm to 6 mm; the width of each of the two II vertical grooves 13 is 1 mm-3 mm, and the depth thereof is 3 mm-6 mm.

A method for measuring the rigidity of a flexible driving shaft (the method is realized based on the device for measuring the rigidity of the flexible driving shaft provided by the invention), which is realized by adopting the following steps:

the method comprises the following steps: firstly, horizontally placing the base 1, then drawing the transparent baffle 3 out of the vertical flat hole 7, and then unscrewing the two fastening screws 5, so that the tail end surfaces of the two fastening screws 5 respectively leave the two clamping bar blocks 4;

step two: bending a flexible driving shaft 16 to be measured, embedding the flexible driving shaft 16 in the semicircular groove 6 and the two II-th vertical grooves 13, and then screwing the two fastening screws 5, so that the tail end surfaces of the two fastening screws 5 respectively push the two clamping bar blocks 4, and the two clamping bar blocks 4 respectively clamp two straight sections of the flexible driving shaft 16; adjusting the position of the flexible driving shaft 16 to make the top point of the arc-shaped section of the flexible driving shaft 16 align with a certain scale value on the scale 2, and reading and recording the scale value;

step three: selecting a thin line 17 and a weight 18; the thin wire 17 is embedded in the I-th vertical groove 12, the head end of the thin wire 17 is fixed with the top of the arc-shaped section of the flexible driving shaft 16, and then the weight 18 is fixed at the tail end of the thin wire 17;

step four: firstly, inserting the transparent baffle 3 into the vertical flat hole 7, and then vertically placing the base 1; at this time, under the action of the gravity of the weight 18, the weight 18 pulls the arc-shaped section of the flexible driving shaft 16 downwards through the thin wire 17, so that the vertex of the arc-shaped section of the flexible driving shaft 16 moves downwards and is aligned with a certain scale value on the scale 2, and the scale value is read and recorded; in the process, the left part and the right part of the arc-shaped section of the flexible driving shaft 16 simultaneously swell and respectively extend into the two transverse flat holes 8;

step five: calculating the rigidity of the flexible driving shaft 16 according to the difference between the two recorded scale values, thereby completing the rigidity measurement; the specific calculation formula is as follows:

in the formula: q represents the stiffness of the flexible drive shaft 16; m represents the mass of weight 18; g represents the gravitational acceleration; s represents the difference between the scale values of the two recordings.

In the second step and the fourth step, the reading of the scale value is performed by using an electronic magnifier.

In the second step, the scale value aligned with the vertex of the arc-shaped segment of the flexible driving shaft 16 is zero.

The theoretical value of stiffness of the flexible drive shaft 16 is calculated as:

in the formula: e represents the modulus of elasticity of the flexible drive shaft 16; r represents the arc segment radius of the flexible drive shaft 16; i represents the moment of inertia of the flexible drive shaft 16; a denotes the cross-sectional area of the flexible drive shaft 16.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.